Okay, the results are below. Remember, I started out with 2 cc of magenta.
Here is how much yellow (in cc / ml) was added (in total) at each dot:
1 0 (All Magenta, no yellow)
2 0.40
3 0.80
4 1.20
5 1.60
6 2.00
7 2.40
8 3.00
9 4.40
10 5.00
11 6.00
12 7.00
13 8.00
That means that the # 6 dot, the "red one" is a 50/50 mixture of Magenta and Yellow, and the #13 dot is a 20/80 mix of Magenta / yellow, or 4 times as much yellow as Magenta.
I was shocked by the results, but when I ended up with a total liquid volume of 10 cc / ml I knew I had kept accurate measurements (2 cc Magenta, 8 cc Yellow).
What do you think?
By the way, the two dots under the first dot are more samples of the mix from the 7th and 13th position dots. I wanted to see them closer together to compare.